As this is the feedstock and a key cost issue is...

As this is the feedstock and a key cost issue is logistics/transport of the proppant to well, an important parameter to consider is the opportunities in the areas with the best transport and logistical infrastructure and most active relevant wells. Texas Eagleford seems to be the most obvious.

We should be thinking about the biggest flyash producers in Tx.

Here is a random piece of internet information on this subject:
http://ftp.dot.state.tx.us/pub/txdot-info/cmd/mpl/flyash.pdf

Is LWPs flyash feedstock class C? or class F?